Means for insulating electromagnets.



D. W. BARTON. MEANs'F'oR lwsuLATlNG ELECTROMAGNETS. APPLICATION FILEDMAY16|1913.

1,174,958. Patented Mar. 14,1916.

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UNITED sfrA'rEs PATENT oEEroE.

DANIEL W. BARTON, OF OSI-IKOSI-I, WISCONSIN, ASSIGNOR TO WARREN G.MAXCY, OF OSHKOSH, WISCONSIN.

MEANS FOR INSULATING ELECTROMAGNETS.

Application led May 16, 1913.

' b all whom t may concern Be it known that 1, DANIEL 1V. BARTON, acitizen of the United States, and resident of Oshkosh, in the county oflinnebago and State of lVisconsin, have invented new and usefulImprovements in Means for Insulating Electromagnets, of which thefollowing is a description, reference being had to the accompanying'drawings, which are a part of this specification.

This invention relates to improvements in means for insulatingelectromagnets from their supports and more particularly to niagnets forplaying musical instruments.

1n constructing electromagnets for use in playing musical instruments inwhich one vibrating magnet is used for each note of the instrumentplayed it has been found dithcult to independently insulate each magnetand also to prevent the vibration of the magnet armatures from beingtransmitted to the instrument support and thereby blast or interferewith the clear vibratory sounds of the notes played.

It is one of the objects of the present invention to overcome theobjectionable features mentioned and provide a means for insulatingelectromagnets from their supports which is adapted to insulate themagnets from each other and from their supports both electrically andvibratorily.

A further object of the invention is to provide a means for insulatingelectromagnets from their supports which is of simple construction, iseasily assembled, is strong and durable and is well adapted for thepurpose described.

lith the above and other objects in view, the invention consists of theimproved means for insulating electromagnets from their supports and itsparts and combinations as set forth in the claims, and all equivalentsthereof.

In the accompanying drawing in which the same reference charactersindicate the same parts in all of the views: Figure 1 is a top view ofone end portion of a support with two electromagnets mounted thereon;Fig. 2 is a transverse sectional view thereof; Fig. 3 is a longitudinalsectional view on a larger scale of one portion of the supporting rod;and Fig. L1 is a fragmentary detail side view of the support.

Referring to the drawing the numeral 8 Specification of Letters Patent.

Patented Mar. 14, 1916.

Serial No. 767,981.

indicates one end portion of the supporting frame which is provided withtransverse recesses or slots 9 to receive the end portions of metalsupporting rods 10 extending therethrough. The transverse recesses areprovided with half bushings 11 of felt or other yielding material uponwhich the rods rest. The rods are also provided with yielding washers 12of similar material positioned on opposite sides of the frame which areheld in place by metal washers 13 and by nuts 14 threaded on the rods.While the rods are only shown as supported on one end it is to beunderstood that both ends are to be supported and insulated in a similarmanner.

The electromagnets used on the supporting frames are of usualconstruction the leading in wire being connected up to one of the coilsand the return wire being connected to the frame, the second coil beinggrounded on the frame. Thus the current passes through the coils andframe so that it is necessary to insulate the frames of the differentmagnets from each other. This is accomplished by insulating the framesfrom the supporting rods upon which they are mounted in a mannerhereinafter described.

The medial portions of the rods are covered with sleeves 15 preferablyof wood or other insulating material which serve to insulate the metalframes 16 of the electromagnets 17 from the rods and also serve toabsorb or insulate the vibrations of the magnets from the rods 10 andthe supporting frame 8. The opposite ends of the sleeves are reduced indiameter to form shoulders 18 which abut against the sides of the magnetframes and also form reduced end portions 19 which extend into the bores20 of the magnet frames. The reduced end portions 10 are slightly lessin length than half of the thickness of the magnet frames to provide forthe shoulders tightly clamping the frames therebetween. The sleeves areheld in proper position on the rods by nuts 21 threaded on the oppositeend portions of the rods and yielding and metal washers 22 and 23respectively, which are interposed between the nuts and the end sleeves.

From the foregoing description it will be seen that the vibrations ofthe magnet are insulated from the supporting frame which is also adaptedto support the musical instrument played and the magnet frames are alsoelectrically insulated from each other and from the supporting frame.

. What claim as my invention is:

l. The combination with an electromagnetic instrument player, of anelectrical and vibratory insulating meanstherefor, comprising a rodextending through the magnet frame, an insulator sleeve surrounding therod and interposed between the frame and the rod, and a support for therod.

2. The combination with an electromagnetic instrument player, of anelectrical and vibratory insulating means therefor, coinprising asupport, a rod extending through the support, a yielding connectioninterposed between the rod and the support, a frame forming part of theelectromagnet mounted on the rod, and an insulating sleeve having areduced end portion which enters a part of the frame and also having ashouldered portion which abuts against a side portion of the frame.

3. The combination with an electromagnetic instrument player, of anelectrical and vibratory insulating means therefor, comprising a supporthaving an opening extending therethrough, a rod extending through. theopening, a yielding material positioned within the opening andinterposed between the rod and the support, a yielding washersurrounding the rod and positioned along side of the support, a frameforming part of the electromagnet mounted on the rod, and an insulatingsleeve having a reduced end portion which enters a part of the frame andalso having a shouldered portion which abuts against a side portion ofthe frame.

4E. The combination with an electromagnetic instrument player, of anelectrical and vibratory insulating means therefor, comprising asupport, a metal rod carried by the support, a plurality of spacedelectroinagnet frames having openings through whichV the rod passes, andinsulating sleeves surrounding the rod and interposed between theinagnet frames to space said frames apart and to insulate them from eachother and the rod.

5. The combination with an electromagnetic instrument player, of anelectrical and vibratory insulating means therefor, comprising asupport, a metal rod carried bythe support, a plurality of spacedelectromagnet frames having openings through which the rod passes, andinsulating sleeves surrounding the rod and interposed between the magnetframes to space said frames apart and to insulate them from each otherand the rod, said sleeves having reduced end portions which enter themagnet frames and also having shouldered portions which abut against themagnet frames. 'Y

6. The combinatiomrwith a plurality of electromagnets of an electricalplayer, of rods passing through the frames of the magnets and means forinsulating the frames from each other against vibration consisting ofnon-vibratory sleeves surrounding the rods and interposed between therods and the frames, a support for the rods having slots therein andnon-vibratory yielding inateiial disposed in said slots between thesupport and the rods.

In testimony whereof, I aiiix my signature, in presence oi twowitnesses.

i DANIEL W. BARTON.

lVitnesses:

RALPH R. HARTLEY, W. B. HARTLEY.

Copies ot' this patent may be obtained for five cents each, byaddressing the Commissioner of Patents.

Washington, D. C. Y

